Malicious PDF — malware analysis report

Static analysis result for SHA-256 b724c3751a576e42…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 18:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e949e1e59db4fc71c9bd3b9898ab8ba SHA-1: d9228f26b4c7613f9e4e9719732b9893129b9333 SHA-256: b724c3751a576e4246dcaabc943398601393565fdc40038f25b58f296c9807f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/47717574713.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610cffcf09b1b---xakiwolemujorupixunaxof.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/zaxiwadusazexeruvowikitit.pdfIn PDF document text
    • http://ccsl.asia/files/wovadijedovuburuwasowite.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/tirurikikagupowerazaj.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/kagazut.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608429780da23---7280411062.pdfIn PDF document text
    • https://dm288.com/slicice/file/82262870693.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/71611674250.pdfIn PDF document text
    • http://expresskaliski.info/file/28358902396.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16123ccb7c8c11---61070341967.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wiguvosojep.pdfIn PDF document text
    • http://kahasat.cz/data/file/jeminuzaposegamulinogix.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9face6e60---jokurajasikelirel.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078215d09489---79523467435.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/vimusolamopeseja.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44abba7801---mosavuji.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kqqgqr8uhrvnkoqpl2502aalu8/jakasewekiwawop.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/36938049816.pdfIn PDF document text
    • https://abeess.com/userfiles/file/sesixerumufamu.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/1897299881.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/42097938501.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c250dfa7---57714251535.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8a0038af50157c629ef9b7958d68c11e/79669019931.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/44759382812.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/8337070144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=english+alphabet+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 10832 bytes
SHA-256: 67f23ceb82b1668ed5ba326a3c8f87d1450e01d36be74d943494b15fc8a285f8
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 17720 bytes
SHA-256: d8d69896d28b1be00a21323ff7634065d1bc6b27cca6c2916876e30d8649e39d
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1